JPH06505U - Backup roll device for rolling mill - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a backup roll device that allows the backup fulcrum to be changed arbitrarily, and that the change operation is easy and the fulcrum positioning is reliable. [Composition] A pair of rolling shafts, which are rotatably supported by the housing of the rolling mill, are cylindrically shaped with a diameter smaller than that of the central cylindrical portion on both sides of the cylinder length and are rotatable and slidable in the axial direction, and are in rolling contact with an intermediate roll. Attach the separation support roll with a short torso width via the slip key. The outer surface of the backup shaft and the inner surface of the separation support roll are surface treated. In addition, the support roll is configured to be individually movable in the axial direction at high speed by a hydraulic cylinder installed in the backup shaft bearing, and the frame inside the frame of the connecting portion provided on the outer side surface of the hydraulic cylinder and the support roll. A deep groove type ball bearing is arranged in.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is used in the field of iron and steel and non-ferrous metals, and is used in a rolling mill for forming a desired plate thickness by passing a plate material such as a steel plate between rolls to perform plastic deformation. The present invention relates to a device for making a backup when performing roll bending.

[0002]

[Prior art]

 Generally, various methods have been proposed to control the shape of the material to be rolled. For example, in a four-high rolling mill, a pair of work rolls having a relatively small diameter are sandwiched from the outside. It is equipped with a backup roll with a relatively large diameter, both of which are formed to have approximately the same cylinder length so that they can roll over the entire length, and a bending cylinder is installed between the bearings of the work rolls. .

The material to be rolled is passed through such a rolling mill to obtain a strip material having a desired plate thickness. As the material to be rolled passes, the central portion of the work roll is expanded, Since the material to be rolled has a so-called middle-high cross-sectional shape with a thick central part and thin side edges, a crown is formed on the backup roll and the bending cylinders act to expand the necks of the work rolls mutually. The work roll is adjusted in such a way that the pressure lower surface of the work roll becomes flat, and shape control is performed to correct the crown generated in the rolled material.

[0004]

[Problems to be solved by the device]

 However, in the above conventional rolling mill, since the work rolls and intermediate rolls are constrained on the entire surface of the back-up rolls, it is difficult to give sufficient roll bending to the work rolls, and absolute shape control capability is lacking. Not only that, but especially in a four-high rolling mill, there is a drawback in that it is necessary to change the crown shape by changing the backup roll depending on the strip width, strength and shape of the material to be rolled. Also, since the backup roll rolling on the work roll and the intermediate roll makes full contact, the backup fulcrum cannot be changed arbitrarily and the shape cannot be controlled at any position. In addition, it is necessary to polish the entire surface of the backup roll in terms of maintenance, and there are drawbacks that maintenance is difficult and sufficient space is required on the side of the rolling mill due to the shift mechanism of the intermediate roll.

Further, in Japanese Patent Laid-Open No. 58-116904, a part of both ends of the body length of a backup roll is tapered, and a pair of sleeves (corresponding to the separation support roll of the present invention) are provided in the roll axial direction. Although a movable structure is disclosed, such a structure still has the following drawbacks.

Since both ends of the backup roll are tapered, the height of the contact portion with the work roll is apt to change when the pair of sleeves are moved left and right in the roll axial direction, and the plate thickness accuracy is maintained. Not at all. Even if a pair of sleeves are attempted to move to the central portion side of the backup roll at the same time during rolling of the material to be rolled, the movement of the sleeves is impossible due to the wedge effect. For this reason, shape control cannot be performed according to the defect of the material to be rolled (for example, edge extension). A large thrust force acts on the sleeve, which complicates the mechanism for holding the sleeve in an appropriate vertical state. Furthermore, if the material to be rolled is rolled until the pair of sleeves and the central part of the backup roll are kept separated, the roll mark once attached to the work roll is likely to be transferred to the material to be rolled. Such drawbacks still remain.

[0007] The purpose of the present invention is to pay attention to the above-mentioned conventional problems, in particular, to have a quick response to the condition that changes momentarily in high-speed rolling, and to greatly increase the bending control amount especially for work rolls or intermediate rolls. Support roll of the rolling mill, which can improve the shape control ability, have a large effect of reducing the edge drop, and can perform shape control at any position in the strip width direction of the rolled material. To provide a device.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the backup roll device of the rolling mill according to the present invention rolls a pair of work rolls that roll down the rolled material, a pair of intermediate rolls that roll to each work roll, and further rolls to an intermediate roll. It is equipped with a backup roll and both end bearings of each roll are attached to the housing, and the pressurizing means for crown control by adjusting the bearing interval between the pair of work rolls and the intermediate roll is installed in the housing. In this rolling mill, a pair of separation support rolls with a short cylinder width, which are separated from each other in the axial direction of the backup shaft, are installed on both sides of the cylinder length of each of the backup rolls. A backup roll that supports a support roll so that it can slide in the axial direction. Hydraulic cylinder installed in the backup shaft bearing, which has a structure in which the backup shaft outer surface or the inner surface of the separation support roll is surface-treated, and is supported by rotation and mounted via a separation support roll and a sliding key. And a deep groove type ball bearing is arranged in the frame of the connecting portion provided on the outer side surface of the support roll.

[0009]

[Action]

 According to the above configuration, the function of each back-up roll, which suppresses the work roll deflection that directly rolls down the material to be rolled, is integrated with the pair of separation support rolls and the central cylindrical part that are rolled on the work roll and separated in the roll axial direction. It is exerted by a back-up shaft that is formed to support the work roll rolling force. The pair of separation support rolls are individually movable in the axial direction, and the bending moment fulcrum is changed by moving the positions, and the roll bending amount is adjusted by the bending means provided on the work roll neck. be able to. Therefore, the overall amount of bending is controlled by the position movement of the separation support rolls, the shape of the crown of the material to be rolled, etc. can be controlled, and the bending moment fulcrum can be changed arbitrarily, so the shape control capability is improved. Greatly improved.

In particular, in the present invention, during rolling, due to the difference in frictional force between the sliding friction that directly slides between the outer peripheral surface of the backup shaft and the inner peripheral surface of the separation support roll, and the rolling friction due to the rotating bearings at both ends of the backup shaft, Since the backup shaft and the separation support roll rotate as a unit, no slippage occurs on the inner surface of the separation support roll and the outer surface of the backup shaft. In addition, since each roll is rotating during rolling (loading), the contact between the intermediate roll, separation support roll and backup shaft results in kinetic friction, and a hydraulic cylinder installed in the backup shaft bearing separates the separation support roll. Can be easily moved to any position in the axial direction of the backup shaft at high speed. In addition, during non-rolling (no load), the separation support roll can be moved at high speed in the axial direction of the backup shaft by using the gap between the support roll inner diameter and the backup shaft outer diameter. Moreover, since the backup shaft has a cylindrical structure, the structure is simple, the cross-sectional performance of the backup shaft can be increased, and the deflection of the shaft can be minimized. At any position, a uniform fixed load is applied to the inner peripheral surface of the separation support roll and no slippage occurs, so there is no risk of seizure even at high rolling loads. For this reason, the separation support roll can be stably held, and the bending fulcrum can be set reliably. In addition, since the cross-sectional performance of the central column of the backup shaft is large, it is possible to provide the backup with sufficient supporting force and to set a high rolling load.

[0011]

【Example】

 Hereinafter, a specific embodiment of a backup roll device for a rolling mill according to the present invention will be described in detail with reference to the drawings.

4 to 5 show the overall configuration of a rolling mill provided with a backup roll device according to the embodiment. As shown in the figure, this rolling mill has a pair of upper and lower work rolls 21 and 22 which are parallel to a gate-shaped housing 20 and are horizontally mounted so as to be capable of rolling contact with each other. It is possible. A pair of intermediate rolls 24 and 26 that are rolled in parallel with the upper and lower work rolls 21 and 22 and sandwich the upper and lower work rolls 21 and 22 from above and below are horizontally mounted on the housing 20. The intermediate rolls 24 and 26 are formed to have a diameter larger than that of the work rolls 21 and 22 to transmit the rolling force. Especially, the body length is set to be equal to or larger than the plate width of the material 23 to be rolled, and It is set to be shorter than the body length of the work rolls 21 and 22. Therefore, when the intermediate rolls 24 and 26 are in full contact with the work rolls 21 and 22 when assembled in the housing 20, the end portions of the work rolls 21 and 22 are, as shown in FIG. It is set so as to protrude from the end of 26 by a predetermined length.

In addition to such a roll row, an upper backup roll device 28 and a lower backup roll device 30 are also laid horizontally in parallel so that the intermediate rolls 24 and 26 are sandwiched between them. .

The upper backup roll device 28 has a back-up shaft 32 arranged in parallel with the intermediate roll 24, and at the center of the backup shaft 32, a columnar part 32 a having a constant width and a short width is separated from the backup shaft 32. It is integrally configured as impossible. Further, both sides of the backup shaft 32 other than the columnar portion 32a have shaft portions 32b having a diameter smaller than that of the columnar portion 32a, so that the pair of separation support rolls 34R, 34L can slide in the axial direction. Is attached to. The pair of separation support rolls 34R and 34L are rotatably contacted with the upper intermediate roll 24, and the backup shaft central cylindrical portion 32a serves as a backup support for the work roll 21 and the intermediate roll 24 during rolling.

Similarly, the lower backup roll device 30 also has a backup shaft 36 and left and right support rolls 38R and 38L that are separated from each other and are mounted on the backup shaft 36. The shaft central cylindrical portion 36a serves as a backup support during rolling.

Further, the separation support rolls 34R, 34L, 38R, 38L are inserted into the backup shaft 32 as shown as a representative of the upper backup roll device 28 in FIG. , 42R are provided, and the backup shaft 32 is attached to the bearing 50 via a roller bearing 81. The outer peripheral surface of the backup shaft 32 and the inner peripheral surfaces of the separation support rolls 34R, 34L have a nitriding treatment, a carburizing treatment, or a ceramic treatment in order to improve surface hardness, wear resistance, heat resistance, and lubricity. It is possible to perform one desired type of surface treatment, such as vapor deposition treatment and chemical densification treatment. The gap between the outer diameter of the backup shaft 32 and the inner diameters of the separation support rolls 34R, 34L is such that the separation support rolls 34R, 34L can move horizontally even if the backup shaft 32 thermally expands. As described above, the surface treatment is not limited to both the outer peripheral surface of the backup shaft 32 and the inner peripheral surfaces of the separation support rolls 34R, 34L, but the outer peripheral surface of the backup shaft 32 or the separation support rolls 34R, The surface treatment may be performed on either of the inner peripheral surfaces of 34L. The slide keys 41L, 41R are attached to the key grooves 41a formed in the axial direction of the backup shafts 32, 36, and the inner peripheral surfaces of the separation support rolls 34R, 34L, 38R, 38L (not shown) are slightly separated from the slide keys 41. The slide key 41 and the backup shafts 32 and 36 are arranged so as to be slidable in a large scale.

As shown in FIG. 5, the neck portions of the upper and lower work rolls 21 and 22 and the intermediate rolls 24 and 26 and the neck portions of the backup shafts 32 and 36 of the upper and lower backup roll devices 28 and 30 are Bearings 46, 47, 48, 49, 50, 52 are mounted, and these are mounted in the housing 20 in tandem. Further, a rolling-down cylinder 54 is provided at a lower position of the housing 20, and a predetermined rolling pressure is generated between the work rolls 21 and 22 by driving the rolling-down cylinder 54.

In such a rolling mill, a specific configuration of the backup roll devices 28 and 30 according to this embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 shows the upper backup roll device 28, in which the central cylindrical portion 32a of the backup shaft 32 has a large cross-sectional performance and minimizes the plate thickness variation of the rolled material. Further, the separation support rolls 34R and 34L slide on the shaft portions 32b on both sides of the back-up shaft 32 so that their positions can be adjusted by sliding movements in the roll axial direction. For this position movement, hydraulic cylinders 81 and 82 as drive members are formed in the bearing 50 of the backup shaft 32 on the separation support rolls 34R and 34L. Further, the separation support rolls 34R and 34L are set so that the separation support rolls 34R and 34L are not tilted during the movement thereof due to the frictional force between the separation support rolls 34R and 34L and the intermediate roll 24 in contact therewith. By supplying and discharging pressure oil, the thrust bearing support 62 (62L, 62R), which is the frame of the connecting portion between the hydraulic cylinders 81, 82 and the separation support roll 34, is pushed and pulled, and the central cylindrical portion of the backup shaft 32 during rolling. The separation support rolls 34R and 34L can be moved with respect to 32a.

Such a configuration is the same in the lower backup roll device 30 as well. Reference numeral 90 is a bellows, which is protected so that scales, foreign matters, rolling oil, etc. do not enter the slide portion. The separation support rolls 34R, 34L, 38R, 38L are mounted on a backup shaft 32 which is rotatably supported by a roller bearing 88 in a bearing 50, as shown in FIG. 1 for the upper backup roll device 28. ing.

Further, a work roll bending device 100 and an intermediate roll bending device 200 are incorporated in the housing 20, which is shown in FIG.

First, the work roll bending apparatus 100 includes an upper roll bending rod 102, a lower roll bending rod 104, a roll bending cylinder block 106, and a piston 108. A lower end portion of the upper roll bending rod 102 is fixed to a piston 108, and an upper end portion thereof is disposed so as to come in contact with and separate from the upper work roll bearing 46. On the contrary, the lower roll bending rod 104 has an upper end fixed to the piston 108 and a lower end that can be brought into contact with and separated from the lower work roll bearing 47. The piston 108 is built in the bore portion 107 of the cylinder block 106, and the bore portion 107 is located in the middle of both pistons 108 and has a small diameter communication hole 110. The pressure oil is supplied from a pressure oil supply device (not shown). Is introduced, the roll bending rods 102 and 104 are separated from each other, and act to press the bearings 46 and 47 of the upper and lower work rolls 21 and 22 toward the bearings 48 and 49 of the intermediate rolls 24 and 26, respectively. .

Similarly, in the intermediate roll bending device 200, a bore portion 207 independent of the bore portion 107 is bored in the cylinder block 106, and a pair of pistons 208 are slidably mounted on the bore portion 207. . An upper roll bending rod 202 and a lower roll bending rod 204 are connected to each piston 208, and the tips of these rods 202 and 204 are projected from the cylinder block 106 to abut the intermediate roll bearings 48 and 49. It is possible. The bore portion 207 is also provided with a small-diameter communication hole 210 in the center thereof, and by introducing pressure oil from the pressure oil supply device into this, the roll bending rods 202 and 204 separate from each other, and the intermediate roll 24 , 26 of the upper and lower backup roll units 28, 30 are pressed against the bearings 50, 52 of the upper and lower backup roll units 28, 30, respectively.

Liners 112 and 114 are attached to the sliding surfaces of the roll bending cylinder block 106 and the upper and lower work roll bearings 46 and 47, respectively, when the pressure oil is supplied to the cylinder block 106. Sliding on the moving surface reduces the sliding resistance between the work roll bearings 46 and 47 and the cylinder block 106.

As shown in FIG. 5, the reduction cylinder 54 has a built-in head 116, and at the time of rolling, the head 116 is moved by introducing pressure oil into the pressure reduction cylinder 54 from a pressure oil supply device (not shown). I am trying to raise it. The operation of the head 116 pushes up the backup shaft bearing 52 of the lower backup roll unit 30, and the reduction force is the lower backup shaft 36, the lower intermediate roll 26, the lower work roll 22, the upper work roll 21, the upper intermediate roll 24, It is transmitted to the upper backup shaft 32, the upper backup shaft bearing 50, and the housing 20 to generate a desired rolling force.

The operation of the rolling mill configured as described above is as follows. Before rolling, the positions of the separation support rolls 34R, 34L and 38R, 38L are determined in advance according to the width of the material 23 to be rolled. In this case, the rolling contact position of the separation support rolls 34 and 38 to the work rolls 21 and 22 is set to a position where it is superposed on the side portion of the material 23 to be rolled. After that, the work rolls 21, 22 and the intermediate rolls 24, 26 and the support rolls 34, 38 are brought into light contact with each other by using the roll bending rods 102, 202 and a roll balancing cylinder (not shown). Then, after that, the hydraulic cylinder 81 for position adjustment of the separation support rolls 34, 38 is driven to move it to a preset position. As a result, the space between the pair of separation support rolls 34R, 34L and 38R, 38L is set to a desired space.

After this initial setting is completed, the rolled material 23 is passed between the work rolls 21 and 22. When the rolled material 23 is passed, the separation support rolls 34 and 38 are pressed against the backup shafts 32 and 36 and the intermediate rolls 24 and 26 via the work rolls 21 and 22, respectively. For this reason, sliding friction occurs between the backup shafts 32, 36 and the separation support rolls 34, 38 as the backup shafts 32, 36 rotate, and the separation support rolls 34, 38 rotate as the backup shafts 32, 36 rotate. Will also be accompanied. That is, during the rolling, since the roller bearing 88 is arranged between the backup shafts 32 and 36 and the bearing 50, rolling friction occurs, and further, sliding friction between the backup shafts 32 and 36 and the separation support rolls 34 and 38 occurs. The separation support rolls 34 and 38 rotate integrally with the backup shafts 32 and 36 due to the difference in frictional force.

As a result, the material to be rolled 23 is rolled into a strip having a desired thickness at the high rigidity portion of the backup shaft central cylindrical portion 32a, and is output as a strip material. A non-contact method using light or magnetism is used. When the ear extension or the middle extension occurs due to this determination, the hydraulic cylinders 81 and 82 are operated so that the paired separation support rolls 34R and 34L and 38R and 38L are brought close to each other or independently. Alternatively, it is possible to obtain a rectangular strip material by adjusting the bending moment amount acting on the work rolls 21 and 22 through the intermediate rolls 24 and 26 by moving them so that they are separated from each other, suppressing the occurrence of abnormal shape. it can. At this time, since the bending amount of the intermediate rolls 24, 26 is controlled by adjusting the bending force of the intermediate roll bending device 200, the amount of position movement of the separation support rolls 34R, 34L and 38R, 38L is controlled. A large shape correction function can be exerted by the interaction with. That is, the correction area can be adjusted by the position movement of the separation support rolls 34R, 34L and 38R, 38L, and the correction amount can be adjusted by the intermediate roll bending device 200.

When the rolled material 23 has edge drops, the bending force of the work rolls 21 and 22 by the work roll bending device 100 is controlled. Since both ends of the work rolls 21 and 22 project from the intermediate rolls 24 and 26, by supplying pressure oil to the bending device 100, the rods 102 and 104 project and the protrusions from the edges of the intermediate rolls 24 and 26. The part is largely bent and acts to control the edge drop. Of course, since the work rolls 21 and 22 also have rigidity, the bending force is transmitted to the intermediate rolls 24 and 26.

According to the rolling mill of this embodiment, the bending fulcrums of the work rolls 21 and 22 or the intermediate rolls 24 and 26 can be freely changed, so that the work rolls 21 and 22 or the intermediate rolls 24 and 26 can be restrained by the conventional full-contact backup roll. Not only can the roll bending effect be fully exhibited, but the shaft diameter of the backup shaft central cylindrical portion 32a is made larger than the diameter of the shaft portion 32b of the backup shaft 32 to increase the rigidity, and The plate thickness of is also accurately maintained. Further, since the positions of the upper and lower separation support rolls 34R, 34L and 38R, 38L can be individually changed, the shape can be controlled at any position in the plate width direction. Therefore, in addition to shape defects such as medium elongation and edge elongation of the rolled material, it is possible to control not only the shape failure of the composite elongation that is a composite of the two.

Further, since the work roll bending device 100 and the intermediate roll bending device 200 are provided, the plate full width shape control is performed by the intermediate roll bending, and the plate end shape control such as edge drop is performed by the work roll bending. Therefore, the control operation becomes very easy. Further, since the positions of the separation support rolls 34R, 34L and 38R, 38L can be symmetrically operated in the vertical and horizontal directions, the shape control can be performed symmetrically in the plate thickness direction and the plate width direction of the material 23 to be rolled, which is excellent. It is possible to obtain rolled products with high accuracy.

In addition, since the positions of the separation support rolls 34R, 34L and 38R, 38L can be freely adjusted by the plate width, the contact surfaces between the work rolls 21 and 22 and the plate width end portions can be more effectively combined with roll bending. It can be made smooth and the edge drop prevention effect is high. Further, since the intermediate rolls 24 and 26 are provided, the diameters of the work rolls 21 and 22 can be made small, so that the rolling load area can be reduced, and thus high pressure rolling can be performed, and the deflection amount of the work rolls 21 and 22 can be reduced. Also, the flat deformation of the roll can be reduced. Further, since the plate thickness and the plate width direction can be controlled symmetrically, the rolled material 23 does not meander when it is threaded, and there is an effect that stable threading characteristics can be obtained.

In the above embodiment, an example of application to the 6-high rolling mill provided with the intermediate rolls 24 and 26 is shown, but it can be applied to the backup roll of the 4-high rolling mill shown in FIG. 7 (1). The diameter of the work rolls 21 and 22 as shown in FIG. 2 (2) can also be applied to a roll having a diameter larger than that of the intermediate rolls 24 and 26. It can also be applied to the backup roll of a cluster rolling machine as shown in Fig. 3 (3). Further, as shown in FIG. 4 (4), it can also be applied to a back-up roll of a rolling mill in which a support roll is fixed to only one side of each back-up shaft 32, 36. Of course, although not shown, it is needless to say that the present invention can be applied to any rolling mill of other special structure, such as a rolling mill having the backup roll device of the embodiment only on the upper portion. Further, in the above-mentioned embodiment, an example of application of the pair of support rolls 34R, 34L or 38R, 38L is shown, but it should be applied to a rolling mill having a plurality of support rolls 34, 38 such as three or four. Is also possible. Further, in the above embodiment, the ball bearing is used as the thrust bearing, but a cross roller bearing field may be used.

[0033]

[Effect of device]

 As is clear from the above description, in the back-up roll device of the rolling mill according to the present invention, a pair of work rolls for rolling down the rolled material, a pair of intermediate rolls for rolling contact with each work roll, and an intermediate roll. And a back-up roll that rolls into the housing. Both end bearings of each roll are attached to the housing, and the pressing means for crown control by adjusting the bearing spacing between the pair of work rolls and the intermediate roll is installed in the housing. In the integrated rolling mill, a pair of separation support rolls with a short cylinder width, which are separated in the axial direction of the backup shaft, are installed on both sides of the cylinder length of each of the above back up rolls and have a cylindrical shape with a diameter smaller than the central cylinder. It is a backup roll that supports this separation support roll so that it can slide in the axial direction. The shaft is rotatably supported by the housing, and is mounted via a separation support roll and a slide key, and the outer peripheral surface of the backup shaft or the inner peripheral surface of the separation support roll is surface-treated to form the backup shaft bearing. Since the deep groove type ball bearing is arranged in the frame of the connecting part provided on the outer side surface of the support cylinder and the hydraulic cylinder installed inside, the bearing is not interposed between the backup shaft and the separation support roll. Unlike the conventional method, the bearing is not restricted in production, and the clearance between the backup shaft and the separation support roll can be easily obtained. Therefore, even if the backup shaft is thermally expanded, the separation support roll can be moved horizontally. Has no effect. In addition, the plate thickness accuracy of the rolled material is improved at the highly rigid part of the central part of the backup shaft, and the horizontal movement of the separation support rolls installed at both ends of the backup shaft reduces the bending amount of the work roll or intermediate roll. It is possible to significantly increase the shape control ability, and the effect of reducing the edge drop is large, and it is possible to perform shape control at any position in the strip width direction of the rolled material. The fruit is obtained. In particular, since the support roll is driven by the hydraulic cylinder, the shape control effect is high, and in particular the hydraulic cylinder can be set so as to prevent it from tilting due to the contact friction of the support roll. Can be made.

[Brief description of drawings]

FIG. 1 is a sectional front view of a main part of a backup shaft device for a rolling mill according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a front view of the rolling mill according to the embodiment.

FIG. 5 is a side view of the rolling mill.

FIG. 6 is a cross-sectional view of a roll bending device of the rolling mill.

FIG. 7 is an example of another rolling mill in which the embodiment backup roll device can be mounted.

[Explanation of symbols]

 20 Housing 21,22 Work Roll 23 Rolled Material 24,26 Intermediate Roll 28,30 Backup Roll Unit 32,36 Backup Shaft 32a Backup Shaft Central Column 32b Backup Shaft Shaft 34R, 34L, 38R, 38L Separation Support Roll 41L Sliding key 41a Keyway 42R, 42L Thrust bearing 46, 47, 48, 49, 50, 52 Bearing 54 Rolling down cylinder 81, 82 Hydraulic cylinder 88 Roller bearing 100 Work roll bending device 200 Intermediate roll bending device

Claims (1)

[Scope of utility model registration request] 1. A pair of work rolls for rolling down a rolled material, a pair of intermediate rolls for rolling contact with each work roll, and a backup roll for rolling contact with the intermediate roll are provided, and both end bearings of each roll are mounted on a housing. In a rolling mill in which a pressurizing means for adjusting the bearing intervals between the pair of work rolls and the intermediate roll to control the crown is installed in the housing, both sides of the body length of the backup rolls are central cylindrical portions. A backup roll which has a smaller diameter cylindrical backup shaft and which is equipped with a pair of separation support rolls with a short body width that are separated in the axial direction and supports the separation support rolls so that they can slide in the axial direction. Is rotatably supported by the housing and is mounted via a separation support roll and a slide key. In addition, the outer surface of the backup shaft or the inner surface of the separated support roll is surface-treated, and the hydraulic cylinder installed in the backup shaft bearing and the frame of the connecting part provided on the outer side surface of the support roll are installed. A backup roll device for rolling mills, which is equipped with deep groove ball bearings.